A feature-film condensation of last year's blockbusting BBC nature series Planet Earth - but, in a somewhat spineless move, it has been shorn of David Attenborough's breathy tones and given instead those of Patrick Stewart, presumably to play to an American market for whom Captain Picard is more trustworthy than the president.

Still, the celebrated photography looks almost ridiculously spectacular on the big screen: every walrus nostril-hair is captured with hyperreal intensity. I can't remember if the environmental lessons were spelled out quite so clumsily in the original, but they feel like an afterthought here - as if the producers were looking for a bit of that Inconvenient Truth effect, and weren't confident the images could speak for themselves. They shouldn't have worried.